Furnace attachment



July 24, 1923- 1,462,922

G. F. SEITZ FURNACE ATTACHMENT Filed May 15, 1920 3 Sheets-Sheet 1 'W vi F1:

' INVENTOR.

. BY m v ATORNEYZ July 24, 1923- -1,462,922

1 G. F. SEITZ FURNACE ATTACHMENT Filed May 15 1920 -3 Sheets-Sheet 2 lillili'll l I v I I YINIVENTOR; Mme I.

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July 24,1923- G. F. SEITZ FURNACE ATTACHMENT Filed May 15, 1920 3 Sheets-Shee'b NVENTOR.

Wsk ATTORNE (1/1 TI /en u Patented July 24, i923 GEORGE F. SEITZ, OF PHILADELPHIA, PENNSYLVANIA.

FURNACE ATTACHI/EENT.

Application filed May 15,

T 0 all whom it may concern:

Be it known that I, GEORGE F. Surrz, acitizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented new and useful Improvements in Furnace Attachments, of which the following is a specification.

This invention relates to stoves and furn-aces, particularly to furnace attachments, and has for its object the provision of a de vice adapted to be located within a furnace immediately above bed of lire therein and which is for the purpose of promoting combustion of the gases rising from the coal whereby to utilize every bit of combustible matter and produce .a much hotter fire than is ordinarily obtained.

An important and more specific object is the provision of a device of this character which comprises means for forming superheated steam and blowing it, together with an air blast, onto the bed of coals, the mixture of superheated steam, a r. and gases within the furnace burning violently and producing a very hot sheet of flame imme diately above the fire.

Another object is the provision of a de vice of this character which includes means for preheating air prior to its mixing with the superheated steam and gases.

Another object is the provision of a device of this character which includes a novel valve mechanism associated with the water feed whereby to prevent blowing back of the water, another feature of the valve mecha-- nism being the provision of an automatically 7 opening safety valve structure for reduction of excessive pressure whereby to avoid bursting any parts of the device.

An additional object is the provision of a device of this character which will be comparatively simple and inexpensive in manufacture and installation highly efficient in use, durable in service, and a general improvement in the art.

lVith the above and other objects and advantages in view, the invention consists in the details of construction to be hereinafter more fully described and claimed, and illu trated in the accompanying drawings in which Figure 1 is a perspective view of a fur nace with a portion thereof broken away to showmy device in position therein,

Figur is a vie through Serial No. 381,691.

water feed device located outside of the-furnace,

Figure 3 is a detail sectional view through the mixing nozzle,

Figure 1 is a detail sectional view through a modified discharge nozzle,

' Figure 5 is a sectional view through another modified form of discharge nozzle, and Figure (3 is a perspective view showing a modified form of the entire device.

Referring more particularly to the drawings, the letter ft designatcs a furnace of ordinary or conventional type. In carrying out my invention I provide a tank 10 secured upon the outside of the furnace at some convenient location and this tank has filling opening normally'closed by a plug 11 and is provided at its bottom with an outlet spigot 12.

Located within the furnace is a casing th upper portion of which leads from 7 pipe 14 extending through the side of the furnace and carrying a valve structure indicated broadly by the numeral 15, and leadmg into this valve structure is a short pipe 16 connected with the bottom of a cup 17 loated immediately beneath the spigot 12 and having an overflow nipple 18., The casing 18 may be secured in position within a fur nace'by any suitable means and may be disposed at the top of the fire box lining B, as shown in Figure 1, or may be so positioned as to be partially embedded within the bed of coals. Within the casing 13 is abaflie 13 The valve structure 15 comprises a casing 19 having a lateral extension 20. Threaded into the upper end of the casing 19 is a plug 21 through which the pipe 16 is threaded, as shown. This plug is formed hollow and internally threaded and engaged within this internally threaded portion is a disk 22 having a hole therein. Also threaded into this plug 21 is a second fixed disk 24: pro. vided with a series of holes 25 and carrying.

fed into the cup 17 will pass through the e g 21, the water striking against the disk 22 and passing through the hole 23 onto the disk 27 frornwhich it will flow onto the disk 24and through the holes 25 therein into the pipe 14 where it will be, converted into steam which will pass into the casing 13 where it will be converted into superheated steam. .lf, for any reason, the pressure within the casing 13 or other pipe 16 and into the plu plate 30 carried on the end of a stem 31 passing slidably through a plug 32 closing the outer end of the extension. A coil spring 33 surrounds the stem 31 and engages the plug 32 and the valve plate 30 for holding the valve plate against the disk 28. In the eventof excessive pressure in any of the apparatus it w ll be seen that pressure within the casing 19 will cause the valve plate 30 to be unseated so that the excess pressure will escape through the hole 29 and through the opening 34 in the plug 32 through which the stem 31 is slidable.

Connected with the top of the casing 13 is a pipe 35 carrying a T 36 which has its upper end carrying an extension iii closed, by a suitable cap. Connected with. the other branch of the T is a pipe 38 which leads into a mixing device designated broadly by the numeral 39. i

This. mixing device comprises a cross.- shaped. casing or coupling 40 which has one branch closed by a plug 41 and which has screwed into another branch the short length. of pipe 38. A reducing coupling 42 is interposed between the casing 36 and pipe 38. Secured within the pipe 38 is a plug 43 into which is'threaded a nozzle 44 having a very small'bore '45 and this nozzle .is located at substantially the center of the cross-shaped coupling or casing'40. It will be observed that this coupling or casing 40 is provided with a plurality of perforations 46. Con nected with another branch of the coupling 40, that is the branch opposite that closed by the plug 41, is a pipe 47 which leads through the wall of the furnace and which is provided externally thereof with a valve 43.

The purpose of this pipe 47 is to conduct air from outside of the furnace to the coupling 40 which constitutes a mixing chamber.. Threaded into the remaining branch of the coupling 40 is a pipe 49 to the end of which is connected, by anelbow 50, an outlet or discharge nozzle comprising a section of pipe 51 threaded into the elbow 50 and carrying at its opposite end a cap 52 provided with a plurality of perforations. The parts are so arranged that the cap 52 will be located a short distance above the bed of fire within the furnace.

The operation of this form of the device is as follows:

When there is a fire in the furnace and it is desired to put my device into operation, it is necessary to open the spigot 12 to the desired extent so that water will drop into the cup 17 from whence it will pass into the casing 19, and into the pipe 14 where it will be converted into steam which will pass into from with a considerable force and this will cause a suction within the coupling 40. Air will then be drawn into the coupling through the pipe 47 leading from the control valve 48 and this valve may of course be suitably-adjusted to regulate the quantity. of air passing into the device. Suction within this mixing device'also causes the coal gas within the furnace to be drawn through the holes 46 into the mixer and the superheated steam, air, and gaswill all be mixed together and will pass along the pipe 49 into the pipe 51 and will be discharged through the perforated cap. This mixture is very combusti ble and will of course burn when it comes in contact with the fire and will produce a very hot sheet of flame-immediately over the coals. In this way all the gas given off by the burning coal is burnt and there isconsequently no waste or smoke. I

if desired, I may omit the mixer 39 and replace it with a plain cross T. In this.

event I would employ the combined mixer and discharge nozzle 51 shown in Flgure 4.

in this form. I provide a pipe 52 closed at one end by a cap 52 formed with perfora tions 53. Located within the pipe 52 is a plug 54 within which is secured a nozzle 55 having a small bore 58. The pipe 52 is formed with a plurality of openings 59 adjacent the discharge end of the nozzle. Also located within the pipe 52 is a plug 60 having a conical recess 61 formed therethrough.

In case the casing 13 is located so as to be practicallyembedded within the fire it may be necessary to use a horizontal type of discharge nozzle instead of the vertical type previously described.

If desired, I replace the mixer 39 with a cross '5' and make use of the nozzle in Figure 5. Referring to this figure it will be seen that the structure is substantially the same as that of Figure 4. The nozzle in this form comprises a pipe 62 having a plug 63 therein through which extends a reducing nozzle 64 having a small bore 65. The pipe 62 is formed with the gas admitting holes 66 and is also provided with a plug 67 having a conical recess 68. The difference between this form and the form shown in Figure 4 is that the lower side of the pipe 62, aswell as the cap 69 on the end thereof, are formed with a plurality of perforations 70. This form maybe interchangedwith the form shown in Figure a, if desired.

.Referring to Figure 6, it will be seen that T have provided a modified form of the device in which means is provided for pre heating the air before it passes to the mixing device. In this form the numeral 71 designates the steam superheating casing, 72 designates the steam forming pipe lead ing thereto and into which water is fed, 73 designates the superheated steam outlet pipe, and 74 designates the mixing device which is formed as a T instead. of the crossshaped member. The mixing device 74 is provided internally with a reducing nozzle 75. Leading from the mixing device 74: is a pipe 77 which carries a discharge nozzle 78 identical. with the device 51. Leading into the mixing device 7 is a pipe 79 which leads to the outside of the furnace and which corresponds to the pipe 47. The clifference between this structure and that shown in Figure 1 is that in this form I provide couplings 8O interposed. in the pipe 7 9 and having connected therewith down 'wardly extending pipes 81 wh ch carry perforated cylindrical members which are partially embedded within the fire bed and which are provided with perforations 83. These members 82 must be formed of re fractory material and they are preferably constructed of fire clay or any suitable material.

In the operation of this form it will be seen that the action is substantially the same as that of the previously described. form except that the air drawn from the outside of the furnace through the pipe 9 is heated on account of the provision of the members 82 and it will be observed that as this air is drawn through the pipe 79 by the passage of superheated steam through the reducing nozzle 75. gas immediately above the burning coals will be drawn through the perforations 83 and will mix with the air in the pipe 79. As this gas is of course very hot the air in the pipe 79 will be heated thereby. In other respects the operation is the same and the mixture of superheated steam, gas, and heated air will be discharged from the end of the nozzle member 78.

From the foregoing description and a study of the drawings it will be apparent that I have thus provided a simply constructed and easily installed device which will greatly increase the heating capacity of the furnace by virtue of the fact that it causes combustion of all. of the gas formed in the furnace and which is ordinarily wasted. The introduction of fresh air from the outside of the furnace of course greatly improves the fire as it supplies additional. oxygen thereto,

While I have shown and described the pre ferred embodiments of my invention, it 1s of course to-be understood that I reserve the right to make such changes in the form, constructlon, and arrangement of parts as will notdepart from the spirit of the invention or the scope of the subjoined claims.

Having thus described my invention, I claim:

1. A furnace attachment comprising a cas' ing located within a furnace in position to be heated by fire therein, a pipe leading from the outside of the furnace into said casing, means for feeding water into said pipe, a pipe leading from said casing, a mixing nozzle carried by said second named pipe, an air inlet pipe leading from the outside of the furnace to said mixing nozzle, and a perforated discharge nozzle connected with said mixing nozzle and located immediately above the bed of fire.

2. A furnace attachment comprising a casing located within a furnace in position to be heated by fire therein, a pipe leading from the outside of the furnace into said'casing, means for feeding water into said pipe, a pipe leading from said casing, a mixing nozzle carried by said second named pipe, an air inlet pipe leading from the outside of the furnace to said mixing nozzle, and a perforated discharge nozzle connected with said mixing nozzle and located immediately above the bed of fire, said mixing nozzle comprising a casing having a plurality of branches into one of which is connected said second named pipe, a pipe connected in the opposite branch and leading to said dis charge nozzle, said air admission pipe being connected in the remaining branch, said last named casing being formed with a plurality of gas admitting openings, and a reducing nozzle within said last named casing and leading from said second named pipe.

3. A furnace attachment comprising a casing located within a furnace in position to be heated by fire therein, a pipe leading into said casing and extending to the outside of the furnace, means for feeding water into said pipe, a mixing device connected with said casing for the passage of superheated steam formed in the latter. means for supplying air to said mixing device, said mixing device including a casing having an 0pening through which gas above the fire is sucked by the passage of superheated steam through the mixing device, and a discharge nozzle connected with the mixing device and positioned to discharge the mixture of superheated steam, air, and gas onto the bed of fire.

A. A furnace attachment comprising a casing located withina furnace in position to be heated by the bed pf fire therein, a vertical baffle plate within said casing, a leading into said casing, a valve structure associated with said mixing device, and a discharge with said pipe and including'a downwardly nozzle connected With said mixing device opening check valve and further including and located immediately above the bed of 10 a laterally opening safety valve, means for fire.

feeding Water into said pipe through said In testimony whereof I hereto aflix my check valve, a mixing device connected with signature.

said casing, an air admission pipe connected I GEORGE F. SEIT Z. 

